Microsemi Corporation SG1526J, SG1526J-883B, SG1526L, SG1526L-883B, SG2526DW Datasheet

SG1526/SG2526/SG3526

REGULATING PULSE WIDTH MODULATOR

DESCRIPTION	FEATURES
The SG1526 is a high performance monolithic pulse width modulator	∙	8 to 35 volt operation
circuit designed for fixed-frequency switching regulators and other	∙	5V reference trimmed to ±1%
power control applications. Included in an 18-pin dual-in-line package	∙	1Hz to 350KHz oscillator range
are a temperature compensated voltage reference, sawtooth oscillator,	∙	Dual 100mA source/sink outputs
error amplifier, pulse width modulator, pulse metering and steering logic,	∙	Digital current limiting
and two low impedance power drivers. Also included are protective	∙	Double pulse suppression
features such as soft-start and undervoltage lockout, digital current	∙	Programmable deadtime
limiting, double pulse inhibit, a data latch for single pulse metering,	∙	Undervoltage lockout
adjustable deadtime, and provision for symmetry correction inputs. For	∙	Single pulse metering
ease of interface, all digital control ports are TTL and B-series CMOS	∙	Programmable soft-start
compatible. Active LOW logic design allows wired-OR connections for	∙	Wide current limit common mode range
maximum flexibility. This versatile device can be used to implement	∙	TTL/CMOS compatible logic ports
single-ended or push-pull switching regulators of either polarity, both	∙	Symmetry correction capability
transformerless and transformer coupled. The SG1526 is characterized	∙	Guaranteed 6 unit synchronization
for operation over the full military ambient junction temperature range of	HIGH RELIABILITY FEATURES - SG1526
-55°C to +150°C. The SG2526 is characterized for operation from -25°C
to +150°C, and the SG3526 is characterized for operation from 0°C to	♦ Available to MIL-STD-883B and DESC SMD
+125°C.
	♦ Radiation data available
	♦ LMI level "S"processing available

BLOCK DIAGRAM

		VREF
	Reference	Undervoltage		+VC
+VIN
	Regulator	Lockout
GROUND		To Internal SYNC
RD
		Circuitry
RT	Oscillator			OUTPUT A
CT
RESET	Soft
CSOFTSTART	Start		S	Q
COMPENSATION				T
	+VIN		R Q	Q
		S	MEMORY	TOGGLE
+ ERROR		Q
	Amp	D	F/F	F/F
— ERROR		Q
		METERING		OUTPUT B
		F/F

+C.S.

—C.S.

SHUTDOWN

4/90 Rev 1.1 2/94	LINFINITY Microelectronics Inc.
Copyright ã 1994	11861 Western Avenue ∞ Garden Grove, CA 92841
1	[phone] ∞ FAX: [phone]

SG1526/SG2526/SG3526

ABSOLUTE MAXIMUM RATINGS (Note 1)

Input Voltage (VIN) ...............................................................

40V

Logic Sink Current

............................................................

15mA

Collector Supply Voltage (VC) .............................................

40V

Operating Junction Temperature

150°C

Logic Inputs .........................................................

-0.3V to 5.5V

Hermetic (J, L Packages) ............................................

Analog Inputs ..........................................................

-0.3V to VIN

Plastic (N, DW Packages) ...........................................

150°C

Source/Sink Load Current (each output) .......................

200mA

Storage Temperature Range ............................

-65°C to 150°C

Reference Load Current ..................................................

50mA

Lead Temperature (Soldering, 10 Seconds) ...................

300°C

Note 1. Exceeding these ratings could cause damage to the device.

THERMAL DATA

J Package:

Thermal Resistance-Junction to Case, θJC ..................

25°C/W

Note A. Junction Temperature Calculation: TJ = TA + (PD x θJA).

Thermal Resistance-Junction to Ambient, θJA ..............

70°C/W

Note B. The above numbers for θJC are maximums for the limiting

N Package:

thermal resistance of the package in a standard mount-

Thermal Resistance-Junction to Case, θJC ..................

30°C/W

ing configuration. The

θJA numbers are meant to be

Thermal Resistance-Junction to Ambient, θJA .............

60°C/W

guidelines for the thermal performance of the device/pc-

DW Package:

board system. All of the above assume no ambient

Thermal Resistance-Junction to Case, θJC ..................

35°C/W

airflow.

Thermal Resistance-Junction to Ambient, θJA .............

90°C/W

L Package:

Thermal Resistance-Junction to Case, θJC ...................

35°C/W

Thermal Resistance-Junction to Ambient, θJA ...........

120°C/W

RECOMMENDED OPERATING CONDITIONS (Note 2)

Input Voltage .............................................................

8V to 35V

Oscillator Timing Capacitor ....................................

1nF to 20μF

Collector Supply Voltage ........................................

4.5V to 35V

Available Deadtime Range at 40KHz

......................

3% to 50%

Sink/Source Load Current (each output) ................

0 to 100mA

Operating Ambient Temperature Range:

-55°C to 125°C

Reference Load Current ...........................................

0 to 20mA

SG1526 .........................................................

Oscillator Frequency Range ..............................

1Hz to 350KHz

SG2526 ...........................................................

-25°C to 85°C

Oscillator Timing Resistor ..................................

2KΩ to 150KΩ

SG3526 ...............................................................

0°C to 70°C

Note 2. Range over which the device is functional.

ELECTRICAL CHARACTERISTICS

(Unless otherwise specified, these specifications apply over the operating ambient temperatures for SG1526 with -55°C ≤ TA ≤ 125°C, SG2526 with

-25°C ≤ TA ≤ 85°C, SG3526 with 0°C ≤ TA ≤ 70°C, and VIN = 15V. Low duty cycle pulse testing techniques are used which maintains junction and case

temperatures equal to the ambient temperature.)

Parameter

Test Conditions

SG1526/2526

SG3526

Units

Min.

Typ.

Max.

Min.

Typ.

Max.

Reference Section (Note 3)

Output Voltage

TJ = 25°C

4.95

5.00

5.05

4.90

5.00

5.10

V

Line Regulation

VIN = 8 to 35V

10

30

10

30

mV

Load Regulation

IL = 0 to 20mA

10

30

10

50

mV

Temperature Stability (Note 9)

Over Operating TJ

15

50

15

50

mV

Total Output Voltage Range (Note 9)

Over Recommended Operating Conditions

4.90

5.00

5.10

4.85

5.00

5.15

V

Short Circuit Current

VREF = 0V

50

125

50

125

mA

Undervoltage Lockout Section

RESET

Output Voltage

VREF = 3.8V

0.2

0.4

0.2

0.4

V

RESET

Output Voltage

VREF = 4.8V

2.4

4.8

2.4

4.8

V

4/90 Rev 1.1 2/94

LINFINITY Microelectronics Inc.

Copyright ã 1994

2

11861 Western Avenue ∞ Garden Grove, CA 92841

[phone]

∞ FAX: [phone]

SG1526/SG2526/SG3526

ELECTRICAL CHARACTERISTICS (continued)

Parameter											Test Conditions	SG1526/2526			SG3526			Units
												Min.	Typ.	Max.	Min.	Typ.	Max.
Oscillator Section (Note 4)
Initial Accuracy						TJ = 25°C							±3	±8		±3	±8	%
Voltage Stability						VIN = 8 to 35V							0.5	1.0		0.5	1.0	%
Temperature Stability (Note 9)						Over Operating TJ							7	10		5	10	%
Minimum Frequency (Note 9)						RT = 150KW, CT = 20mF								1.0			1.0	Hz
Maximum Frequency						RT = 2KW, CT = 1.0nF						350			350			KHz
Sawtooth Peak Voltage						VIN = 35V							3.0	3.5		3.0	3.5	V
Sawtooth Valley Voltage						VIN = 8V						0.5	1.0		0.5	1.0		V
Error Amplifier Section (Note 5)
Input Offset Voltage						RS £ 2KW							2	5		2	10	mV
Input Bias Current													-350	-1000		-350	-2000	nA
Input Offset Current													35	100		35	200	nA
DC Open Loop Gain						RL ³ 10MW, TJ = 25°C						64	72		60	72		dB
High Output Voltage						VPIN1 - VPIN2			³ 150mV, ISOURCE = 100mA			3.6	4.2		3.6	4.2		V
Low Output Voltage						VPIN2 - VPIN1			³ 150mV, ISINK = 100mA				0.2	0.4		0.2	0.4	V
Common Mode Rejection						RS £ 2KW						70	94		70	94		dB
Supply Voltage Rejection						VIN = 8V to 35V						66	80		66	80		dB
PWM Comparator Section (Note 4)
Minimum Duty Cycle						VCOMPENSATION = 0.4V								0			0	%
Maximum Duty Cycle						VCOMPENSATION = 3.6V						45	49		45	49		%
Digital Ports					and
	(SYNC,		SHUTDOWN,				RESET)
HIGH Output Voltage						ISOURCE = 40mA						2.4	4		2.4	4		V
LOW Output Voltage						ISINK = 3.6mA							0.2	0.4		0.2	0.4	V
HIGH Input Current						VIH = 2.4V							-125	-300		-125	-300	mA
LOW Input Current						VIL = 0.4V							-225	-500		-225	-500	mA
Current Limit Comparator Section					(Note 6)
Sense Voltage						RS £ 50W,			TJ = 25°C			90	100	110	80	100	120	mV
Input Bias Current													-3	-10		-3	-10	mA
Soft-Start Section
Error Clamp Voltage						RESET		= 0.4V					0.1	0.4		0.1	0.4	V
CS Charging Current						RESET = 2.4V						50	100	200	50	100	200	mA
Output Drivers (each output) (Note 7)
HIGH Output Voltage						ISOURCE = 20mA						12.5	13.5		12.5	13.5		V
						ISOURCE = 100mA						12	13		12	13		V
LOW Output Voltage						ISINK = 20mA							0.2	0.3		0.2	0.3	V
						ISINK = 100mA							1.2	2		1.2	2	V
Collector Leakage						VC = 40V							50	150		50	150	mA
Rise Time						CL = 1000pF							0.3	0.6		0.3	0.6	ms
Fall Time						CL = 1000pF							0.1	0.2		0.1	0.2	ms
Power Consumption Section (Note 8)
Standby Current						SHUTDOWN					= 0.4V		18	30		18	30	mA

Note 3. IL = 0mA

Note 4. FOSC = 40KHz (RT = 4.12KΩ ±1%, CT = .01μF ±1%, RD = 0Ω) Note 5. VCM = 0 to 5.2V

Note 6. VCM = 0 to 12V

Note 7. VC = 15V

Note 8. VIN = 35V

Note 9. These parameters, although guaranteed over the recommended operating conditions, are not tested in production.

4/90 Rev 1.1 2/94	LINFINITY Microelectronics Inc.
Copyright ã 1994	11861 Western Avenue ∞ Garden Grove, CA 92841
3	[phone] ∞ FAX: [phone]